Final answer:
Yes, it is acceptable to tell a hypothetical narrative in the introduction of a narrative essay.
Step-by-step explanation:
Yes, it is acceptable to tell a hypothetical narrative in the introduction of a narrative essay. The introduction is meant to engage the reader and draw them into the essay, and a hypothetical narrative can be an effective way to do that. For example, if the essay is about the impact of climate change, the introduction could begin with a hypothetical scenario of a future where the effects of climate change are fully realized.